var nID="nav0";
function hover(id){
if(nID!=id){
document.getElementById(nID).className="wb";
document.getElementById(nID+"_cont").style.display="none";
nID=id;
}
if(nID!="nav0"){
document.getElementById(id).className="wb2";
document.getElementById(id+"_cont").style.display="block";
}
}